Remove admin files deprecated in Django 1.4

Remove "ADMIN_MEDIA_PREFIX" (deprecated in Django 1.4)

Delete lms/static/admin resources as they are no longer needed
for the admin page as of Django 1.4

Moved two files that were referenced elsewhere:
lms/static/admin/js/jquery.min.js -> lms/static/js/admin/jquery.min.js
lms/static/admin/js/urlify.js -> lms/static/js/admin/urlify.js


"ADMIN_MEDIA_PREFIX" and having css/js assets were necessary for the admin page in Django 1.3 but was deprecated in 1.4. We no longer need these files and the admin page works just fine without them. See https://docs.djangoproject.com/en/1.4/ref/settings/ for reference.
This isn't the wiki admin page, right? It seems like the wiki template just grabbed `urlify.js` out of the admin site because it was there, and since it's no longer part of the admin page, maybe it should just go into js/vendor.